We've made two updates to improve the experience of editing product reference list metafields. This metafield type contains a list of links to other products and is also used by the Shopify Search & Discovery app for the 'Related Products' field.
Previously you needed to enter the Shopify IDs of products you wanted to reference but now you can select them from a popup window.
We've also added an option to exclude the matching product from the list of products you're adding. If you select this option, the new product reference list won't include a reference to itself. You can use this to easily have a group of products all relating to each other, without any self-references.